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• What version of ffmpeg is bundled inside electron ?

  7 août 2020, par greghmerrill

  The prebuilt electron binaries for Windows include the file ffmpeg.dll. How can I determine what version of the underlying ffmpeg library is actually compiled to produce this dll ? I need this information to understand what known vulnerabilities (CVE's, etc) might be in a given version of electron via ffmpeg.

  



  As I understand it, the ffmpeg dll itself is taken from https://github.com/electron/nightlies/releases/ when I download my dependencies (I'm using electron-prebuilt-compile). But I'm not getting a clear picture of what the source for that binary is. I think it might be from https://chromium.googlesource.com/chromium/third_party/ffmpeg/ but then I'm not clear on the relationship of that repo with the original ffmpeg repo (e.g. how often are fixes merged from the ffmpeg repo to the chromium third-party repo, etc.)

  



  I tried searching the content of the dll as per cody's suggestion, but no luck :

  



  $ strings ffmpeg.dll  | grep -i ffmp
FFmpeg video codec #1
Huffyuv FFmpeg variant
Not yet implemented in FFmpeg, patches welcome
C:\projects\libchromiumcontent\src\out-x64\static_library\ffmpeg.dll.pdb
ffmpeg.dll


$ strings ffmpeg.dll  | grep -i version
H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
MPEG-4 part 2 Microsoft variant version 1
MPEG-4 part 2 Microsoft variant version 2
MPEG-4 part 2 Microsoft variant version 3
H.263+ / H.263-1998 / H.263 version 2
On2 VP6 (Flash version)
On2 VP6 (Flash version, with alpha channel)
old standard qpel (autodetected per FOURCC/version)
direct-qpel-blocksize bug (autodetected per FOURCC/version)
edge padding bug (autodetected per FOURCC/version)
strictly conform to a older more strict version of the spec or reference software
minor_version
premiere_version
quicktime_version
Assume this x264 version if no x264 version found in any SEI


  


• avfilter/vf_convolution : add x86 SIMD for filter_3x3()

  27 juin 2019, par Ruiling Song

  avfilter/vf_convolution : add x86 SIMD for filter_3x3()
  Tested using a simple command (apply edge enhance) :
  
  ./ffmpeg_g -i /Downloads/bbb_sunflower_1080p_30fps_normal.mp4 \
  
   -vf convolution="0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128" \
  
   -an -vframes 1000 -f null /dev/null
  The fps increase from 151 to 270 on my local machine.
  Signed-off-by : Ruiling Song <ruiling.song@intel.com>
  

  • [DH] libavfilter/convolution.h
  • [DH] libavfilter/vf_convolution.c
  • [DH] libavfilter/x86/Makefile
  • [DH] libavfilter/x86/vf_convolution.asm
  • [DH] libavfilter/x86/vf_convolution_init.c

• lavc/hevcdec : move active VPS from HEVCParamSets to HEVCContext

  5 juin 2024, par Anton Khirnov

  lavc/hevcdec : move active VPS from HEVCParamSets to HEVCContext
  Active VPS is a property of the decoding process, not of the list of
  
  parameter sets.
  Check that the VPS can only change in a base layer - while this can
  
  never happen currently (as no other layers can exist in the decoder), it
  
  will become useful when multilayer decoding is supported.
  

  • [DH] libavcodec/hevc/hevcdec.c
  • [DH] libavcodec/hevc/hevcdec.h
  • [DH] libavcodec/hevc/ps.c
  • [DH] libavcodec/hevc/ps.h